Unplug everything in that circut, shut off the breaker all the way, then reset it.
Push the reset button again with nothing plugged in and see if it resets.
Any moisture at all in the plugs or the lamp sockets would be enough to trip a GFI.
Push the reset button again with nothing plugged in and see if it resets.
Any moisture at all in the plugs or the lamp sockets would be enough to trip a GFI.